Creativity 50 2010: Sachin Agarwal and Garry Tan

Simple. That's the kernel decree behind the fast-growing Posterous, an easy-to-use blogging toolset that's already clocked a monthly audience of more than 3 million in just over a year, according to Quantcast. Founders Sachin Agarwal and Garry Tan launched the site in the summer of 2008 after facing frustration with existing blog services. "You had Flickr for photos, YouTube for videos, but not one personal destination site where you could put it all up," Mr. Agarwal said about what prompted him and Mr. Tan to start the company. The two put their respective computer science degrees from Stanford to use by coding Posterous so that anyone can publish and maintain a blog simply by e-mailing entries—whether text, photo, music or video—to a single e-mail address. No need to sign up for an account. Posterous hosts everything.
Avid Posterous user Steve Rubel, senior VP-director of insights for Edelman Digital, says it is exactly the site's ease of publishing that gives it an edge. "Twitter took off because it was simple," he says. "These guys have a similar shot, too, if movers and shakers start showing what you can do with it."

Mr. Agarwal, on how they've grown so fast: "It's just the product itself. It appeals to a lot of people. Our philosophy is everyone has something to post."